Examples of org.iq80.leveldb.WriteBatch

org.iq80.leveldb.WriteBatch
chirino.com">Hiram Chirino


            // remove the exchange
            byte[] rc = levelDBFile.getDb().get(lDbKey);


            if (rc != null) {
                WriteBatch batch = levelDBFile.getDb().createWriteBatch();
                try {
                    batch.delete(lDbKey);
                    LOG.trace("Removed key index {} -> {}", key, new Buffer(rc));


                    // add exchange to confirmed index
                    byte[] confirmedLDBKey = keyBuilder(getRepositoryNameCompleted(), exchangeId);
                    batch.put(confirmedLDBKey, exchangeBuffer.toByteArray());
                    LOG.trace("Added confirm index {} for repository {}", exchangeId, getRepositoryNameCompleted());


                    levelDBFile.getDb().write(batch, levelDBFile.getWriteOptions());
                } finally {
                    batch.close();
                }
            } else {
                LOG.warn("Unable to remove key {} from repository {}: Not Found", key, repositoryName);
            }

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    this.db = db;
  }
    
  @Override
  public void run() {
    WriteBatch batch = db.createWriteBatch();
    
    try {
      for (BasicMetricHour metricHour : metricHourList) {
        batch.put(bytes(liveStatsBucketKey + metricHour.getAccountName() + ";" + metricHour.getHoursSince1970() + ";" + metricHour.getGuiPath()), bytes(gson.toJson(metricHour)));
      }
    } finally {
      try {
        batch.close();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }

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    deleteMetricHours(keysToDeleteList);
  }


  private void deleteMetricHours(List<String> keysToDeleteList) {
    WriteBatch batch = db.createWriteBatch();
    try {
      for (String key : keysToDeleteList) {
        batch.delete(bytes(key));
      }
      
      db.write(batch);
    } finally {
      try {
        batch.close();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }

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        alertEvaluationsToAdd.add(newAlertEvaluation);
      }
    }
    
    //Write the new Alert Evaluations to the new queue
    WriteBatch batch = db.createWriteBatch();
    try {
      for (BasicAlertEvaluation alertEvaluation : alertEvaluationsToAdd) {
        batch.put(bytes(alertEvaluationQueueBucketKey + ";new;" + alertEvaluation.getAccountName()), bytes(new Gson().toJson(alertEvaluation)));
      }
      
      db.write(batch);
    } finally {
      try {
        batch.close();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }

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    @Override
    public void applyChanges( MapChanges changes )
        throws IOException
    {
        final WriteBatch writeBatch = db.createWriteBatch();
        try
        {
            changes.visitMap( new MapChanger()
            {


                @Override
                public Writer newEntity( final EntityReference ref, EntityDescriptor entityDescriptor )
                    throws IOException
                {
                    return new StringWriter( 1000 )
                    {


                        @Override
                        public void close()
                            throws IOException
                        {
                            super.close();
                            String jsonState = toString();
                            writeBatch.put( ref.identity().getBytes( charset ), jsonState.getBytes( charset ) );
                        }


                    };
                }


                @Override
                public Writer updateEntity( final EntityReference ref, EntityDescriptor entityDescriptor )
                    throws IOException
                {
                    return new StringWriter( 1000 )
                    {


                        @Override
                        public void close()
                            throws IOException
                        {
                            super.close();
                            String jsonState = toString();
                            writeBatch.put( ref.identity().getBytes( charset ), jsonState.getBytes( charset ) );
                        }


                    };
                }


                @Override
                public void removeEntity( EntityReference ref, EntityDescriptor entityDescriptor )
                    throws EntityNotFoundException
                {
                    writeBatch.delete( ref.identity().getBytes( charset ) );
                }


            } );
            db.write( writeBatch );
        }
        finally
        {
            writeBatch.close();
        }
    }

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            // remove the exchange
            byte[] rc = levelDBFile.getDb().get(lDbKey);


            if (rc != null) {
                WriteBatch batch = levelDBFile.getDb().createWriteBatch();
                try {
                    batch.delete(lDbKey);
                    LOG.trace("Removed key index {} -> {}", key, new Buffer(rc));


                    // add exchange to confirmed index
                    byte[] confirmedLDBKey = keyBuilder(getRepositoryNameCompleted(), exchangeId);
                    batch.put(confirmedLDBKey, exchangeBuffer.toByteArray());
                    LOG.trace("Added confirm index {} for repository {}", exchangeId, getRepositoryNameCompleted());


                    levelDBFile.getDb().write(batch, levelDBFile.getWriteOptions());
                } finally {
                    batch.close();
                }
            } else {
                LOG.warn("Unable to remove key {} from repository {}: Not Found", key, repositoryName);
            }

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  public void undo(Map<byte[], ? extends Map<byte[], ?>> persisted, long version) throws IOException {
    if (persisted.isEmpty()) {
      return;
    }
    DB db = getDB();
    WriteBatch batch = db.createWriteBatch();
    for (Map.Entry<byte[], ? extends Map<byte[], ?>> row : persisted.entrySet()) {
      for (Map.Entry<byte[], ?> column : row.getValue().entrySet()) {
        byte[] key = createPutKey(row.getKey(), column.getKey(), version);
        batch.delete(key);
      }
    }
    db.write(batch, service.getWriteOptions());
  }

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  }


  public void deleteRows(byte[] prefix) throws IOException {
    Preconditions.checkNotNull(prefix, "prefix must not be null");
    DB db = getDB();
    WriteBatch batch = db.createWriteBatch();
    DBIterator iterator = db.iterator();
    try {
      iterator.seek(createStartKey(prefix));
      while (iterator.hasNext()) {
        Map.Entry<byte[], byte[]> entry = iterator.next();
        if (!Bytes.startsWith(KeyValue.fromKey(entry.getKey()).getRow(), prefix)) {
          // iterator is past prefix
          break;
        }
        batch.delete(entry.getKey());
      }
      db.write(batch);
    } finally {
      iterator.close();
    }

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    Iterator<byte[]> rows = toDelete.iterator();
    byte[] currentRow = rows.next();
    byte[] startKey = createStartKey(currentRow);
    DB db = getDB();
    DBIterator iterator = db.iterator();
    WriteBatch batch = db.createWriteBatch();
    try {
      iterator.seek(startKey);
      if (!iterator.hasNext()) {
        return; // nothing in the db to delete
      }
      Map.Entry<byte[], byte[]> entry = iterator.next();


      // iterate over the database and the rows to delete, collecting (raw) keys to delete
      while (entry != null && currentRow != null) {
        KeyValue kv = KeyValue.fromKey(entry.getKey());
        int comp = Bytes.compareTo(kv.getRow(), currentRow);
        if (comp == 0) {
          // same row -> delete
          batch.delete(entry.getKey());
          entry = iterator.hasNext() ? iterator.next() : null;
        } else if (comp > 0) {
          // read past current row -> move to next row
          currentRow = rows.hasNext() ? rows.next() : null;
        } else if (comp < 0) {

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    DBIterator deleteIterator = db.iterator();
    seekToStart(deleteIterator, startRow);
    final int deletesPerRound = 1024; // todo make configurable
    try {
      Row rowValues;
      WriteBatch batch = db.createWriteBatch();
      int deletesInBatch = 0;


      // go through all matching cells and delete them in batches.
      while ((rowValues = scanner.next()) != null) {
        byte[] row = rowValues.getRow();

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